214 THE CANADIAN ENTOMOLOGIST 



publications, especially on the Aphiclida', are well known. "The 

 Life-hirttory of Two Species of Plant-lice inhabiting both the 

 Witch-hazel and Birch," issued as Technical Bulletin No. 9, is a 

 remarkable contribution, and one which took nearly twenty-two 

 years of patient labour to complete. Two other important publica- 

 tions are "The Life-history of the Alder Blight Aphis," issued as 

 Technical Bulletin No. 24, and the "North American Phylloxerinie 

 Affecting Hicoria (Car\a) and other Trees." This latter, published 

 in Volume IX of the Proceedings of the Davenport Academy of 

 Sciences, comprises pp. 185 to 273, accompanied by 21 plates. It 

 is, indeed, a valuable contribution. The Kntomological Society of 

 Ontario occasionally recei\ed from Mr. Pergande short articles for 

 publication in this journal. 



The death of Mr. Pergande, who was the oldest assistant, in 

 continuous service, in the Bureau of Entomology, Washington, 

 D.C., took place after a brief illness of less than two weeks. The 

 work he accomplished during his long engagement in the service, 

 of the United States Government will long be appreciated. We, 

 in Canada, were indeed sorry to learn of his demise. 



Arthur Gibson. 



NOTES AND QUERIES. 

 Inhabitants on an April Mud Puddle. 



On the afternoon of April first I determined to start out on the 

 initial 1916 collecting trip in spite of the ice on the pond nearby 

 and the still lingering snowdrifts in the woods. 



Wading along in the open water, at the edge of the pond, I 

 started out a few Peltodytes (Cnemidottis) and Ilydroporus, and 

 discovered a couple of Matus bicarinatus on the under side of a 

 board. Passing on uj) the hill, after investigating a shallow pool 

 at the foot without success, through the oak scrub to an abandoned 

 gravel pit, I came upon a small puddle of water about two inches 

 deep and six feet square. After stirring this up and taking a few 

 Hydrohiiis fuscipes and one Ilydroporus tristis, I proceeded to 

 tread the few inches of soft earth into a mass of mud and water, 

 with the following surprising results, which came floating to the 



